High Precision Metrology and Measurement Method Development

Filter monochromator setup for determination of spectral response.
© Fraunhofer ISE
Filter monochromator setup for determination of spectral response.

CalLab PV Cells at Fraunhofer ISE offers measurement/calibration services for solar cells using many different PV technologies and works at a national and international level with companies and institutes to develop accurate measurement methods for new technologies. CalLab PV Cells is one of the world's leading photovoltaic calibration laboratories. The calibration laboratory serves as a benchmark for research and industry, and solar cell manufacturers commission us to calibrate their reference solar cells for production use to international standards.

CalLab PV Cells is accredited according to ISO/IEC 17025 as a calibration laboratory for solar cell calibration with the Deutscher Kalibrierdienst (DKD). Working hand in hand with PV manufacturers and with the support of the German Federal Ministry of Economics and Technology (BMWi) and the European Union (EU), we are working on continuously improving measurement uncertainties and developing new measurement methods.
In order to ensure comparability of different solar cell technologies, increased efforts are being made to develop measurement methods for novel solar cells. The focus is on thin-film and organic solar cell technologies. Multijunction cell structures present a particular challenge. We can meet this challenge by making good use of our experience in the calibration of multijunction solar cells for space and terrestrial concentrator applications.
We are developing detailed characterization methods for advanced material and cell analysis. In addition to accurate spatially resolved methods for determining charge carrier lifetimes, these developments include methods for the distribution of interstitial iron concentration and high-resolution luminescence spectroscopy for measuring metallic precipitates, voltages and electrical material quality.